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The first microprocessor from Intel. Designed by Marcian E. "Ted" Hoff at Intel in 1971, it was a 4-bit, general-purpose CPU initially developed for the Japanese Busicom calculator. Running at a clock rate of 740 kHz, the 4004 could address 4KB of ROM for a program and 640 bytes of RAM for input/output.

A Small But Great Start
Given the tiny amount of RAM the 4004 supported, it was limited to calculator-like applications. Nevertheless, it was the beginning of a long line of microprocessors. The 4040 successor added interrupts, 24 index registers (up from 16) and a second 4KB program bank.

The 4004 CPU
With only 2,300 transistors, the general-purpose 4004 launched Intel into the microprocessor business. (Image courtesy of Intel Corporation.)

The 4004-Based Busicom Calculator
The product that inspired Ted Hoff to create the 4004. (Image courtesy of AUCTION TEAM BREKER, Cologne, Germany, (c) 2013, www.breker.com)
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4004 lead sponsor Delegate Lynne Arvon said, "This is a commonsense follow-up to what we've seen in our country with Planned Parenthood this past year.
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40(th) Anniversary of the Intel[R] 4004, the World's First Microprocessor
Salsbury, 4004 Pacific Avenue, Erie, Pa 16506 and then proceed to all other locations.
SDK'; TSE: 4004, US: SHWDF) is a major manufacturer and marketer of chemical products serving a wide range of fields ranging from heavy industry to the electronic and computer industries.